when was your last trip?这个地方为什么不用were用was

when was your last trip?这个地方为什么不用were用was “When was your last trip? 为什么是How was your last school trip而不是How were your last schoo your trip last was when 连词成句 how was your day?中的was 为什么不用were If today was your last day 这句歌词,不是虚拟语气么...为什么不用were. when was your last holiday还是when were your last holiday When were you born?和When was your daughter born?中,为什么一个用were How was your trip toYancheng last week? 英语翻译那为什么用were不用was? how was their holiday 为什么用was而不用were If today were the last day.那句话中为什么用were,而不用was.求高人指点